[luatex] LuaTeX v1: Two questions from testing

Joseph Wright joseph.wright at morningstar2.co.uk
Thu Oct 13 09:01:12 CEST 2016


On 13/10/2016 07:33, Joseph Wright wrote:
> Hello,
> 
> Testing LuaTeX v1, there are relatively few changes from v0.95. However,
> I've found one logging (?) change and one hyphenation change I didn't
> expect. With example
> 
>     \hsize 15em
>     This is a supercalifragilisticexpialidocious%
>      \hbox to 1em{}
>      sentence.
>     \tracingall
>     \belowdisplayskip=0pt %
>     $$
>     y = mx + c
>     $$
>      \bye
> 
> The results are different from pdfTeX in two ways. The empty \hbox does
> not prevent hyphenation, which it has to-date (so this is not a result
> of other hyphenation changes). The log also lacks the zero skip after
> the display.
> 
> It's not clear to me if either of these changes is deliberate: what's
> the situation?
> 
> Josph

Also, I assume that the fact the following doesn't show a \discretionary
is deliberate:

    \tracingall
    119-139
     \bye

Joseph



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